EMT comes in several flavors. There is basic EMT, thin, galvanized steel pipe, which is relatively light and easily bent. It is used in residences and business type structures where it is unlikely to come under physicalstress or attack. Then there is rigid EMT, which is thick, hardened pipe suitable for industrial applications. Rigid conduit is used where the wires inside must have the greatest level of protection (usually explosion proof). Rigid is heavy, bulky, and can be challenging for the electrician to bend properly with a number of manual or electric pipe benders.